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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

You need to click on releases then binaries to see the binaries in zip format.
There is also a .run version, which is intended to be self installing, but might require jumping through some hoops on Ubuntu.

Using these instructions, to the point I'm at, I appear to be doing something wrong.

Step 1: Install Java JRE in Ubuntu by launching a terminal (ctrl+alt+t). Then enter the following command and hit enter key.

sudo apt-get install openjdk-7-jre

You need to type in your users password or admin password for this. Hit enter key after typing your password and youll be asked if you wanted to continue, press y key to continue with the installation.

If you ask how to check if Java is installed on Ubuntu Linux (Java JRE)?, then just type which java in your Ubuntu terminal. It should output /usr/bin/java.

Step 2: Download the binaries in zip format for the latest Unicenta oPOS Software from this page. In Ubuntu or Linux Mint, the default download location path is /home/your-user-name/Downloads.

Step 3: After downloading the ZIP file, copy the file to /usr/bin/. To do this, open a terminal (ctrl+alt+t) and type in sudo cp ~/Downloads/unicentaopos-xxx.zip /usr/bin/. Substitute xxx with the version number of your downloaded Unicenta ZIP file.

Extract the downloaded Unicenta ZIP file.

How to extract the zip file in Ubuntu? To extract the ZIP file, switch back to your terminal and type in sudo unzip unicentaopos-xxx.zip -d /usr/bin/unicenta/

Step 1 is done, step 2 is done, step 3 appears to have went successfully, but I cannot get step 4 to work.

EDIT: Not step 4, haven't gotten there yet. The 2nd part of step 3 is my problem.

Generally it is not recommended to install by hand into /usr/. All packages there should be managed by package manager. When installed manually it should go to /usr/local/, it is much easier to manage it there, perform upgrades, remove if necessary. Most elegant solution is to create a deb or rpm package of out-of-repo software and install it using your package manager.